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(METH)acrylic resin composition, imidized (METH)acrylic resin composition, and film obtained by molding them

a technology of acrylic resin and composition, which is applied in the field of (meth)acrylic resin composition, imidized (meth)acrylic resin composition, and film obtained by molding, can solve the problems of poor folding resistance of the film, poor chemical resistance of the conventional acrylic film, and poor resistance to aqueous alkali solution and the like, so as to improve the moldability, improve the alkali resistance, and improve the chemical resistance

Inactive Publication Date: 2010-04-15
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020]The present invention can provide a (meth)acrylic resin composition from which a film having excellent chemical resistance (in particular, Coppertone (registered trademark) resistance) can be obtained. Also, when the acid value of the resin composition is controlled, a film also having improved alkali resistance can be produced.
[0021]Furthermore, when the melt viscosity of the resin composition is controlled, moldability is improved, and, thus, a film having a good appearance can be produced.DESCRIPTION OF THE INVENTION
[0022]The present invention relates to a (meth)acrylic resin composition and an imidized (meth)acrylic resin composition. In the present invention, “(meth)acrylic-based resin” refers to an acrylic-based resin and / or a methacrylic-based resin.
[0023]The (meth)acrylic resin composition of the present invention is obtained by heating a (meth)acrylic-based resin (C), wherein the (meth)acrylic-based resin (C) is obtained by polymerizing a monomer mixture (A) in the presence of an alkyl acrylate-based crosslinked elastic particle (B).
[0024]The acrylic acid ester-based crosslinked elastic particle (B) of the present invention is obtained by copolymerizing 0.5 to 5 parts by weight of a polyfunctional monomer having two or more non-conjugated double bonds per molecule, with respect to 100 parts by weight of a monomer mixture (b) containing 50 to 100 wt % of alkyl acrylate monomer and 0 to 50 wt % of alkyl methacrylate monomer, in one or more stages (the monomer constituent materials or the reaction conditions can be adjusted so as to perform multi-stage copolymerization). It is more preferable that the monomer mixture (b) contains 60 to 100 wt % of alkyl acrylate monomer and 0 to 40 wt % of alkyl methacrylate monomer. It is preferable that the alkyl methacrylate monomer is contained in a ratio of 50 wt % or less in view of the folding resistance of a molded product or a film that can be formed from the obtained (meth)acrylic resin composition.
[0025]It is preferable that the alkyl acrylate, alkyl methacrylate, and other reactive monomers of the monomer mixture (b) used in the crosslinked elastic particle (B) have an alkyl group with 1 to 12 carbon atoms in view of the polymerization reactivity or the cost. Specific examples thereof include methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, methyl acrylate, n-butyl acrylate, and the like. These monomers may be used alone or in a combination of two or more types.

Problems solved by technology

However, conventional acrylic films do not have sufficient chemical resistance, thermal resistance, hardness, folding resistance, and whitening-upon-folding resistance, which are properties needed for these applications.
However, this resin is very brittle, and, thus, there is a problem in which, when the resin is formed into a film and used to laminate a base material, the folding resistance of the film, which is needed as a property for such treatment, is poor.
In the case where a large amount of acid anhydride groups are contained as in this resin, resistance to an organic solvent and the like is excellent, but there is a problem in that the resistance to an aqueous alkali solution and the like becomes poor.

Method used

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  • (METH)acrylic resin composition, imidized (METH)acrylic resin composition, and film obtained by molding them

Examples

Experimental program
Comparison scheme
Effect test

production example 1-1

Production of (Meth)Acrylic-Based Resin (C)

[0165]The following substances were loaded into an agitator-equipped 8 L polymerizer.

Deionized water200partsDioctyl sodium sulfosuccinate0.25partsSodium formaldehyde sulphoxylate0.15partsEthylenediaminetetraacetic acid disodium0.005partsFerrous sulfate0.0015parts

[0166]After the internal portion of the polymerizer was purified sufficiently with nitrogen gas so that oxygen was not substantially present, the internal temperature was set to 60° C., and 20 parts of the monomer mixture functioning as the starting material of the acrylic acid ester-based crosslinked elastic particle (B) shown in C1-1 in Table 1 (i.e., a monomer mixture comprising 2.1 parts of AlMA and 0.2 parts of CHP with respect to 100 parts of a monomer mixture comprising 90% of BA and 10% of MMA) were added continuously at a rate of 10 parts / hour. After the addition, the polymerization was allowed to continue for 0.5 hours, and an acrylic acid ester-based crosslinked elastic p...

example 4

[0174]With respect to 100 parts of the resin powder C1-4 of the (meth)acrylic-based resin (C), 50 parts of the methacrylic-based resin SUMIPEX LG (manufactured by Sumitomo Chemical Co., Ltd., acid value=0 mmol / g) were blended, and the mixture was melt-kneaded using a vented 40 mmφ single-screw extruder in which the cylinder temperature was set to 260° C., and resin pellets of the (meth)acrylic resin compositions (4) and (5) were obtained. Here, in the NMR measurement of the (meth)acrylic resin composition (4), the peak derived from a tertiary-butyl group near 1.3 to 1.5 ppm had disappeared, confirming that a desorption reaction had progressed.

[0175]The properties of the obtained (meth)acrylic resin composition were evaluated. The results together with the acid value of the (meth)acrylic resin composition are shown in Table 2.

[0176]It was confirmed by acid value measurement that a carboxylic acid group was present in the (meth)acrylic resin composition (4) obtained by blending the re...

example 5

[0177]With respect to 100 parts of the resin powder C1-5 of the (meth)acrylic-based resin (C), 50 parts of the methacrylic-based resin HT121 (manufactured by ALTUGLASS, acid value=0.45 mmol / g) were blended, and the mixture was melt-kneaded using a vented 40 mmφ single-screw extruder in which the cylinder temperature was set to 260° C., and resin pellets of the (meth)acrylic resin composition (5) were obtained. Here, in the NMR measurement of the (meth)acrylic resin composition (5), the peak derived from a tertiary-butyl group near 1.3 to 1.5 ppm had disappeared, confirming that a desorption reaction had progressed.

[0178]The properties of the obtained (meth)acrylic resin composition were evaluated. The results together with the acid value of the (meth)acrylic resin composition are shown in Table 2.

[0179]It was confirmed by acid value measurement that a carboxylic acid group was present in the (meth)acrylic resin composition (5) obtained by blending the resin powder C1-5 of the (meth)...

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Abstract

The present invention provides a (meth)acrylic resin composition comprising a carboxylic acid group produced by heating a (meth)acrylic-based resin (C), wherein the (meth)acrylic-based resin (C) is obtained by polymerizing a monomer mixture (A) containing 80 to 99 wt % of a linear alkyl (meth)acrylate and 1 to 20 wt % of tertiary-butyl(meth)acrylate, in the presence of an acrylic acid ester-based crosslinked elastic particle (B) that is obtained by mixing and polymerizing 0.5 to 5 parts by weight of a polyfunctional monomer having at least two non-conjugated double bonds per molecule, with respect to 100 parts by weight of a monomer mixture containing 50 to 100 wt % of an alkyl acrylate monomer and 0 to 50 wt % of an alkyl methacrylate monomer. This composition can be used to produce a film having excellent chemical resistance (in particular, sun-screening agent resistance).

Description

TECHNICAL FIELD[0001]The present invention relates to a (meth)acrylic resin composition, an imidized (meth)acrylic resin composition, and a film obtained by molding them.BACKGROUND ART[0002]Recently, in the market, there is a strong interest in films having excellent chemical resistance, thermal resistance, hardness, folding resistance, and whitening-upon-folding resistance. Specifically, they are used, for example, as films used to laminate vehicle interior or exterior parts as a coating substitute, films used as a floor material, and the like. However, conventional acrylic films do not have sufficient chemical resistance, thermal resistance, hardness, folding resistance, and whitening-upon-folding resistance, which are properties needed for these applications.[0003]Polyglutarimide obtained by treating an acrylic-based resin with an imidizing agent, thereby introducing an imide group into a high-molecular weight chain, is known as a resin that can be provided with chemical resistan...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L33/10C08F8/30B32B15/09B32B27/36
CPCB32B15/08B32B27/308C08F220/10C08F265/04C08F265/06C08L33/08C08L33/10C08L51/003B32B27/30B32B15/082C08L2666/04C08L2666/02B32B7/12B32B15/18B32B27/08B32B27/18B32B27/281B32B27/302B32B27/304B32B27/306B32B27/36B32B2264/025B32B2270/00B32B2307/306B32B2307/412B32B2307/50B32B2307/712B32B2307/714B32B2419/00B32B2457/00B32B2471/00B32B2479/00B32B2551/00B32B2605/00B32B2607/02Y10T428/31681Y10T428/31721Y10T428/31786Y10T428/31935Y10T428/31699
Inventor INARI, HIROFUMITANAKA, KATSUYUKINISHIMURA, KIMIHIDE
Owner KANEKA CORP
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